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1. Evaluation of Inoculation Methods to Reproduce Sunflower Premature Ripening Caused by Phoma macdonaldii

Author:
Seassau, C.; Debaeke, P.; Mestries, E.; Dechamp-Guillaume, G.
Source:
Plant disease 2010 v.94 no.12 pp. 1398-1404
ISSN:
0191-2917
Subject:
Helianthus annuus,   etc   ; sunflower seed products; Phoma; plant pathogenic fungi; fungal diseases of plants; seed development; pathogenicity; laboratory techniques; experimental design; mycelium; conidia; crop residues; disease severity; necrosis; signs and symptoms (plants); root systems; aerial parts; germplasm screening;     Show all 18 Subjects
Abstract:
... Three inoculation methods were evaluated for effectiveness to cause sunflower premature ripening (PR). Evaluations were conducted on a sunflower (Helianthus annuus) cultivar susceptible to PR in replicated, multilocation experiments under greenhouse conditions. Plants were inoculated with Phoma macdonaldii, either with mycelium, conidia, or infected residues at the stem base or with buried residue ...
DOI:
10.1094/PDIS-03-10-0180

2. First Report of Rhizoctonia solani Causing a Disease of Sunflower in India

Author:
Srinivasan, K.; Visalakchi, S.
Source:
Plant disease 2010 v.94 no.4 pp. 488
ISSN:
0191-2917
Subject:
Helianthus annuus,   etc   ; sunflower seed products; field crops; Thanatephorus cucumeris; plant pathogenic fungi; fungal diseases of plants; disease outbreaks; signs and symptoms (plants); disease incidence; disease course; root crown; pathogen identification; disease diagnosis; pathogenicity; mortality; new geographic records; strain differences; India;     Show all 18 Subjects
Abstract:
... During the spring of 2009, symptoms including leaf yellowing and wilting, root rot, and death of plants were noted in sunflower (Helianthus annuus L.) crops in Dharmapuri District, Tamilnadu, India. In some fields, approximately 30% of the plants were affected. The disease began when plants were approximately 10 weeks old and occurred on scattered or adjacent plants. The presence of white mycelium ...
DOI:
10.1094/PDIS-94-4-0488C

3. Head Rot of Sunflower Caused by Rhizopus oryzae in New Mexico

Author:
Sanogo, S.; Etarock, B.F.; Angadi, S.; Lauriault, L.M.
Source:
Plant disease 2010 v.94 no.5 pp. 638
ISSN:
0191-2917
Subject:
Helianthus annuus,   etc   ; sunflower seed products; field crops; Rhizopus oryzae; plant pathogenic fungi; plant rots; disease outbreaks; disease incidence; wild plants; signs and symptoms (plants); pathogen identification; disease diagnosis; polymerase chain reaction; internal transcribed spacers; ribosomal DNA; microbial genetics; pathogenicity; new geographic records; New Mexico;     Show all 19 Subjects
Abstract:
... Head rot was found in cultivated sunflower (Helianthus annuus) in eastern New Mexico in Tucumcari in 2007 and Clovis in 2007 and 2009 and in south-central New Mexico near Las Cruces in 2009. The disease was also observed in wild sunflower near Clovis in 2008. Disease incidence was 10 to 40% in cultivated sunflower and approximately 30% in wild sunflower. Heads were brown to dark brown with discolo ...
DOI:
10.1094/PDIS-94-5-0638C